High-pressure sodium discharge lamp
CA 1205118 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Van Der Heijden, Rudolf L.A.; Dorleijn, Jan W.F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High-pressure sodium discharge lamp. The invention relates to a high-pressure sodium lamp provided with an elongate discharge vessel in which the pressure P in the operative condition of the lamp is at least 170 103 Pa. The lamp is suitable to be operated with a power of periodically alternating value which power comprises at least one component having a frequency ?i which satisfies i - 0,45 ? 2.35 ?i Le/e ? i + 0,45 where i is an integral positive number c is the, speed of sound in the gaseous part of the filling and Le is the effective length of the discharge vessel. According to the invention, the relation is satisfied : M?i ? fi ? d ? 185, in which M?i is the modulation depth of the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 27, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 27, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.